Decelerating circuit



Aug. 13, 1963 l E'. R. nous-EK, JR 3,100,554

DECELERATING CIRCUIT lfilcl'sept. 22. '1961 2 Mgwa,

United States Patent O 3,109,554 DECELERATING CIRCUIT Edward R. Doubek, Jr., Brookleld, lll., assigner to Western Electric Company, Incorporated, New York, NX., a corporation of New York Filed Sept. 22, 1961, Ser. No. 140,097 4 Claims. (Cl. 18S-F161) This invention relates Ito a decelerating circuit, and more specically to a circuit Vfor decelerating power driven apparatus to a secondary speed of operation. Objects of this invention areto provide new and improved circuits of such nature.

yIn Vthe manufacture of wound capacitors, material is fed from supply reels to a motor driven winding arbor whereon the material is wound at a high speed. Since the winding larbor is operated at a high speed, `it is diicult to control the oper-ation thereof so that the winding arbor is stopped precisely when a prescribed number of wind-` ings have been wound thereon. Also, if the winding arbor is stopped too rapidly, the supply reels are caused to overtravel so that the material forms billows between the supply reels and the `winding arbor. Therefore, Vit is desirable to drive the winding arbor by a two-speed motor so that Ithe speed of operation of the winding arbor may be reduced, as the winding operation nears completion, to overcome these diiculties. Preferably, a series-wound, two-speed motor is utilized to drive the winding arbor since `a high torque is required toinitiate a winding oper,-- tion. l However, if the two-speed motor is merely switched ito its secondary speed of operation as a winding operation nears completion, the motor decelerates to its secondspeed too slowly.

Therefore, another object of the invention is to brake a two-speed motor for a prescribed period of time in order to rapidly decelerate the motor to its secondary speed.

Another object rotthis invention is to provide a new, improved, and reliable decelerating circuit to be used in the manufacture of wound capacitors for decelerating a two-speed motor to its secondary speed of opera-tion so that the stopping of the winding yarbor may be controlled more precisely andso tha-t overtravel of the supply reels is eliminated. t v -An additional object'of this invention is tol provide a new, improved, and reliable decelerating circuit for decelerating `a two-speed motor to its secondary speed of operation by utilizing the same brake as is used to stop the motor `at 'the completion of an operation.

A further object rofthis invention is to provide a new, improved, simple, and economical decelerating circuit fory power driven apparatus which is regulatable lso that the amountyof deceleration may be varied between predetermined limits. f f

With these and other objects in mind, the present invention relates to a circuit for decelerating power driven apparatus. The power driven apparatus is decelerated by associating energizing circuitry with La brake winding which causes the brake winding to be energized for a prescribed period of time so thatthe power driven apparatus is decelerated. When the energizing circuitry is not ICC determinedpercentage of the desired capacitance valuel of the capacitor has been reached, a winding controller 13 is actuated. The Winding controller 13 actuates a speed controller 14 which operates to switch the motor \12 to its secondary speed of operation and actuates a decelerating circuit 15 which operates to energize an electrically energized friction brake 16 for a prescribed period of time so that the motor 12 is rapidly decelerated to its `secondary speed of operation. At the completion of the winding operation, the winding controller 13 is again actuated. The winding controller 13 again actnates the speed controller 14 which operates Htoswitch the motor 12 oif and. actuates a braking circuit 17 which operates to energize the friction brake 16 so that the motor 12 is rapidly stopped.

The decelerating circuit 15 illustrated in detail in FIG. 2 includes a brake winding B1 of a commercial electrically energized friction brake which is mechanically `associated with the two-speed motor 12. The brake winding B1 includes a field L1 and a field resistance RL.

The decelerating circuit 15 is provided so that the brake iield L1 may be energized fora prescribed period of time, which causes the motor 12 to be rapidly decelerated to its second speed of operation when the speed controller 14 has been actuated -to switch the motor 12 to its secondary speed of operation. At the completion of the winding operation, the motor 12 is switched off and the brake tield L1 is energized by the braking circuit 17 so that the motor is rapidly stopped. It is desirable to decelerate the motor 12 -to its secondary speed of operation prior to the completion of the winding operation so that, at the completion of the winding operation, the stopping of lthe motor may be controlled more precisely and so that overtravel of the material being wound is eliminated. A relay RYZ is provided to associate the brake winding B1 with either the Adecelerating circuit 15 or the braking circuit 117. During normal operation of the winding arbor 1'1, the relay RY2 is deenergized yand its contact arm S2 engages a primary `(deenergized) contact terminal K3 so that the brake winding B11 is associated with the decelerating circuit 15. When the winding arbor 11 and the motor 12 are to be stopped, the relay RY2 is energized and associated with the brake winding, it is associated with conditioning circuitry so that it is conditioned for a subsequent deceleratingoperation. g

,Other objects, advantages, and aspects of the invention Vwill becomeapparent by reference to the following decation of the invention in a winding operation; and

IFIG. 2 is a circuit diagram of a decelerating circuit in accordance with a preferred embodiment of the invention.

the Contact arm S2 engages a secondary (energized) contact terminal K4 so that the brake winding B1 is associated with the braking circuit 17.

A variable resistor R1 and :a fixed resistor R2 are connected in parallel 'with the brak-e winding B1 when the brake winding is associated with the decelerating circuit so that the `amount of time the brake eld L1 is energized for a decelerating operation is regulatable between predetermined limits. The value of the ixed resistor R2 determines the minimum amount of time that the brake field L1 is energized, and the variable resistor R1 allows for varying the Yamount of time 'that the brake iield L1 is energized between the minimum amount of time as determined by the lvalue of the iixed resistor R2 Sand a maximum yamount of time as determined by the cumulative valueof the fixed resistor R2 and the variable resistor R1 when the 'variable resistor R1 is at its maximum resistance setting. Thus, yit may be seen that the amount of time that the brake field L1 is energized is directly proportional to the cumulative value of the' resistors R1 and R2. The resistor R2 also limits the maximum amount of current that may flow :in the deceler-ating circuit during a decelerating operation so that the circuit components are protected thereby.

The fixed resistor R1 and the variable resistor R2 are utilized rather than a single variable resistor with a minimum resistance stop since they provide a vernier effect, that is, they provide for tine adjustment of the cumulative resistance Value. f

A capacitor C1 is included inthe decelerating circuit and may be selectively connected, by operation of a relay `lYlll, either (l) in a capacitor changing circuit CC1 so that it is charged to a predetermined potential, or (2) in parallel with bothk the brake @winding B1 and the series arrangement of :the resistors Rll and R21 so that it discharges therethrough to provide energizing potential for ythe brake iield L1.

The relay RY1 has a contact arm S1 which engages either a primary (deenergized) contact terminal K1 or Va secondary (energized) contact terminal K2. During a capacitor Winding operation, the relay RY1 is deenergized so that the contact arm S1 engages the primary contact terminal K1 which connects the capacitor C1 in the charging circuit CO1 and, when the motor 12 is to be decelerated toits `secondary speed of operation as the capacitor winding operation nears completion, the relay RYl is energized under control of the winding controller 13 so that the contact arm S1 engages the secondary contact terminal K2 which connects the 'charged capacitor C1 in parallel 'with both the brake Winding B1 and the series resistors R1 'and RZ.

Y VThe capacitor charging circuit CCl is provided for charging the capacitor O1 and for operating as the capacitor C1 in parallel with both the brake Winding BilVA and the series resistors R1 `and R2, the capacitor C1 discharges partially through the resistors Ril yand R2 and Vpartially through the brake 'winding `B1 so that the brake field L1 is energizedfor prescribed period of time and `so that the motor i12 4is rapidly decelerated to its secondary speed of operation if the speed controller 14 has been actuated to switch the motor 12 to its secondary speed of operation.

As the capacitor C1 discharges partially through the lbrake winding B1, the brake field L1 is rapidly energized so that the brake 16 engages the motor 12 and causes the motor to be decelerated rapidly. The amount of ener-y -gization of the brake field L1 then decays due to its inherent characteristics, as the capacitor continues to discharge partially therethrough, until the brake 16 drops out of engagement with the motor 12 and then the motor is free to operate at its secondary speed of operation. The

period of decay of the brake winding L1 and thus the amount of time that the brake 16 engages the motor 12 are dependent on the setting of the variable resistor R1 as set lfort-h hereinabove. The relay RYl is deenergized after the brake 16 drops out of engagement -with the motor '12 so that the capacitorACi is connected in the charging circuit CC1 *and is again charged to a predetermined potential.

When the motor 112 is to be stopped at the'completion of the ywinding operation, the speed controller 1d operates to switch the motor off and the relay RYZ is energized -f to connect the )brake winding B1 in the charging circuit CC-l (braking circuit `17' so that the brake ieldw L1 is 4In Vthe Iwindin-g of capacitors, theamountof over-travel scope thereof.

of the material being wound is -a direct function of both the physical size of the capacitor being wound and the physical size of the supply reels from which the material is fed. Thus, it is desirable to be able to vary the amount of deceleration of the motor 12 in Iaccordance fwiththe physical sizes of the capacitor being wound and the supply reels. There-fore, the variable resistor R1 has been provided in parallel with the brake winding B1 so that the amount of time that the brake iield L1 remains energized and thus the amount of deceleration of the motor -12 are regulatable between predetermined limits by Varying the ,setting of the variable resistor R11. Y

lt may now be seen that a decelerating circuit has been provided for decelerating power driven apparatus so that the lapparatus may be decelerated to a secondary speed of operation by utilizing the same brake that is used to stop the power drivenapparatus.

It -is to be understood that the above-described arrangement is simply illustrative of the application of this invention. devised by those skilled `in the art which will embody the principles of the invention and fall within the spirit and What is claimed is: Y

`l. A decelerating circuit for operating a brake that is mechanically associated with power drivenY apparatus, rwhich comprises a brakeWind-ing for operating the brake Iwhen energized; a capacitor for providing energizing po- Vten-tial for the brake winding when charged; -a capacitor charging circuit; a variable resistor connected in parallell varying the setting ofthe variable resistor, the power driven apparatus being decelerated in response to and in proportion to the amount of time that the brake winding isrenergized, and sec-ond switch means tor connecting the brake 'winding to the charging circuit so that the brake winding may be .continuously energized for any desired period of time. v

2. The decelerating circuit as recited in claim l, wherein the variable resistor includes a series arrangement of a iiXed resistor' and a variable resistor. K

3. A decelerating -circuit for operating a brake which comprises a 4bralte winding for operating the brake when energized; decelerating means `for energizing the brake Y winding for a prescribed period of time; means for conditioning the decelerating means for a decelerating operation; A

means for selectively associating the decelerating means with either the ybrake rwinding or the conditioning means; and stopping means for energizing the brake Winding for -an indefinite period of time through continuous association with the conditioning means. Y Y,

4. The decelerating circuit 4as recited in claim 3, wherein means are provided :for regulating the amount of time that the brake winding is energized by the decelerating means.

References Cited in the le of this patent UNITED STATES PATENTS Decker et al` a Dec. 2l, 1954 Peras K VMar. 8, 1950 Numerous: other arrangements may be readilyV 

3. A DECELERATING CIRCUIT FOR OPERATING A BRAKE WHICH COMPRISES A BRAKE WINDING FOR OPERATING THE BRAKE WHEN ENERGIZED; DECELERATING MEANS FOR ENERGIZING THE BRAKE WINDING FOR A PRESCRIBED PERIOD OF TIME; MEANS FOR CONDITIONING THE DECELERATING MEANS FOR A DECELERATING OPERATION; MEANS FOR SELECTIVELY ASSOCIATING THE DECELERATING MEANS WITH EITHER THE BRAKE WINDING OR THE CONDITIONING MEANS; AND STOPPING MEANS FOR ENERGIZING THE BRAKE WINDING FOR AN INDEFINITE PERIOD OF TIME THROUGH CONTINUOUS ASSOCIATION WITH THE CONDITIONING MEANS. 